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The GAUSS Project GAUSS G ALILEO A nd U MTS S ynergetic S ystem Project Coordinator: A. Di Fazio (Telespazio) Presented.

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Presentation on theme: "The GAUSS Project GAUSS G ALILEO A nd U MTS S ynergetic S ystem Project Coordinator: A. Di Fazio (Telespazio) Presented."— Presentation transcript:

1 The GAUSS Project GAUSS G ALILEO A nd U MTS S ynergetic S ystem Project Coordinator: A. Di Fazio (Telespazio) Presented by A. Vernucci (Space Engineering) GAUSS URL:

2 SUMMARY Project overview Findings and Developments Trials Next milestones

3 RTD project co-funded by the EC-IST Programme GAUSS GAUSS G ALILEO A nd U MTS S ynergetic S ystem 2 years, starting December 2000 Duration Consortium Project Overview

4 Objectives To provide enhanced Location-Based services for Info-mobility and Inter-modality applications, by the integration of Satellite Navigation and Communications functions. Main project aims are: To study and assess the GAUSS reference model, integrating NAV (GALILEO) and COM (S-UMTS-compatible) functions (the GAUSS Target System) To demonstrate the GAUSS approach by exploiting existing facilities and performing new developments where required (the GAUSS Demonstrator) To contribute in the standardisation process, with regard to both Galileo and UMTS Project Overview

5 HISTORY Methodology User Needs Analysis User Requirements Trial Campaign & Result Evaluation Demonstrator Design & Development Jun 01Sep 02Dec 02Dec 00Sept 01Feb 02Jul 02 Realistic implementation of the GAUSS model, based on: existing infrastructures available standard Navigation Satellite Systems (the Mediterranean Test Bed - MTB) for positioning a GEO satellite payload (EMS) for communication the Gateway Station located at LARIO (owned by Telespazio) new hardware and software: an advanced multi-mode Mobile Terminal a low-rate S-UMTS-compatible access system innovative applications using GIS technology GAUSS future solution, integrating: Galileo for Navigation S-UMTS for Communications Target System Definition

6 Main Challenges applications To develop advanced and innovative applications n advanced multi-mode user terminal To develop an advanced multi-mode user terminal handling, in integrated manner, the COM and the NAV signals appearing in: ü the S-UMTS band (COM signal) ü the GPS, EGNOS and GALILEO bands (NAV signal) To specify and implement an access system tailored upon location-based services (requiring low-capacity and bursty resources) and featuring maximum commonalties with the emerging S-UMTS standard (W-CDMA) Project Overview

7 GAUSS Services Location-Based (i.e. integrated NAV/COM) services integrity and high accuracy (1-5m) (for Navigation) global coverage, high reliability and continuity, quasi real-time (for Communications) Characterised by the following requirements: very great number of Mobile Users (MUs) for each Service Provider (SP) and Service Centre (SC) Messages originating from MU always carry Position-Velocity & Timing (PVT) data Project Overview

8 Bursty and unbalanced traffic, with greater capacity requirement in the RL with respect to the FL Services handled by GAUSS typically feature: Two-way messages exchange between MUs and SPs/SCs Low-bit rate transmission by the MUs of small data packets carrying accurate position and timing data either periodically or asynchronously (e.g. upon request or following an event) Messages can be generated: Support of requirement for message acknowledgement Project Overview

9 point-to-point (P-to-P), MU SP (NAV related messages) SP MU (service provisioning messages or ACK) broad (B)-casting, SP all MU/subscribers broad-catching, SP all MU/subscribers multi (M)-casting, SP a group/set of MU multi-catching, SP a group/set of MU H ighly reliable and near real-time c ommunications: Service features: 1% - message loss probability 8 * 424 bit - maximum message size 1 msg/sec. - maximum message transmission rate 0.85 sec. - message transmission time 1% - blocking probability at busy hour Project Overview

10 GAUSS Approach vs. S-UMTS The GAUSS system: is conceived to constitute one of the UMTS RANs, optimized for the provision of location-based services The GAUSS RAN is envisioned as fully integrated within the overall UMTS, not a competitor: standard interfaces to the UMTS CN to be possibly complemented by other via-satellite RANs for supporting higher traffic levels and bit-rates the GAUSS RAN is specifically designed to effectively and efficiently fulfil the requirements of inter-modality and info-mobility applications (small-size messages, low bit rate) Project Overview

11 Tight integration & harmonisation between the 3G mobile networks and the GAUSS satellite component supporting the NAV/COM services: Common Core Network, but distinct Radio Access Networks Single User Terminal (dual mode) for Satellite and Terrestrial access Basic System Design Concepts and Drivers Reference to current standards with regard to architecture, interfaces, protocols Use of consolidated and existing technologies as much as possible Project Overview

12 The GAUSS Integrated NAV/COM Reference Model Project Overview

13 Designed for maximum consistency with emerging S-UMTS standards Adaptations required to best suit a service environment characterized by: many MTs featuring very low activity highly-bursty low-rate communications support of broad/multi-casting communications transmission of structured short data packets GAUSS radio protocols and access scheme Project Overview

14 The GAUSS Demonstrator Findings and Developments

15 The GAUSS Integrated NAV/COM Message Structure remaining 48 bytes constitute the information field: service id SP/SC or MU ID PVT data auxiliary optional data 5 bytes for the header fixed length(53-byte) a common structure for all GAUSS services and applications GAUSS Cell At application level, GAUSS messages are formatted as cells (the GAUSS Cell), characterised by: Findings and Developments

16 GAUSS applications typically require transmission of just 1 cell. Longer messages are anyway also supported, by concatenating up to 8 cells (424 bytes) A GAUSS packet comprises the GAUSS cell plus the overhead needed for EDC and burst preamble Messages are encapsulated into an UDP segment by the application, before delivery to the Upper Layers The GAUSS message format is flexible, and capable of supporting virtually all kinds of message-based services (e.g., the so-called SAR services), in addition to those demonstrated within GAUSS Findings and Developments

17 The GAUSS S-UMTS compatible access system The GAUSS access system was developed with regard to specifications being currently considered for S-UMTS Access is based on SW-CDMA: Forward Link: a solution close to DSCH approach specified by 3GPP Return Link: a reservation-based approach, based upon synchronous CDMA (GPS-assisted), with requests in slotted Aloha Findings and Developments

18 The GAUSS User Terminal a standard graphic system for position visualisation on digital maps An multi-mode Mobile Terminal breadboard is being produced, comprising both ad-hoc developments and off-the-shelf items, i.e.: an integrated NAV / COM digital receive front-end, able to de-multiplex: the NAV signals: the current GPS signal simulated Galileo signals (E1 + E5) and the COM signal, in the S-UMTS band for COM: a transmit front-end, and a baseband & control section operating on CDMA and supporting the upper protocol layers for NAV: a navigation receiver Findings and Developments

19 Innovative applications, based on GIS technology and exploiting the integrated satellite NAV / COM functions, for: Use of consolidated open standards for distributed applications development (open-source components, standard data formats, protocols and interfaces) assisted river navigation inter-modal transport management (road/river) The GAUSS Applications Findings and Developments

20 Trials Components The Gateway Station The Gateway Station located at Lario (Telespazio earth station) The User Terminal The User Terminal Installed on a vessel and on a car The Service Segment The Service Segment the Service Centre the Authority the Service Provider The D-GPS System The D-GPS System The MTB System The MTB System (Mediterranean Test Bed) The Access System The Access System Low-rate, S-UMTS compatible The ITALSAT EMS The ITALSAT EMS (European Mobile System)

21 Inter-modality scenario with inland- waterways as core mode of transport ARNI ARNI REGIONAL BOARD FOR INLAND NAVIGATION cargo boat loaded with hazardous goods (gas) Validation of the applications with direct involvement of a real user and environment: Trials

22 Next Milestones Forecoming Events GAUSS Demonstrator AIT finalisation (July 2002) Trial results analysis and evaluation Trials campaign (scheduled to start by August 2002) Thank you for your attention…

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